On Tue, Feb 01, 2005 at 11:38:02AM +1100, Benjamin Herrenschmidt wrote: > > > Also notice that ':=' uses all over. No need to use late evaluation when > > no dynamic references are used ($ $@ etc.). > > Hrm... Rusty tells me that you got it backward ;) Anyway, I'll stick > to := for now, it's not really an issue.
:= Right hand side is evaluated when encountered. Often what you want. So for example CC := cc here CC is assigned the value cc when seen. = Right hand side is evaluated only when left hand side is used. Also very usefull. Example just mocked up: cmd_vdso32_cc = $(CC) -T $^ -o $@ Doing late evaluation will cause correct replacement of $^ and $@ when used. When cmd_vdso_32 is defined make does not know the desired values for $^ and $@ - this is only known when cmd_vdso_32 is actually used. Hope this clarifies it. Sam - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/